140/80-19 FT50 second generation Flat Track tire has an awesome new tread design. Admit it, you love it! This is the optimal rear tire for flat track bikes that need to throw down faster lap times. This tire is designed and developed with the same compound and performance that all dirt track Hoosier Racing Tires are made from. The FT50 compound is our medium compound used for blue grooved intermediate ½ mile track racing. for an advantage over the competition.